--- libaitsync/src/tool.c	2011/05/08 00:49:45	1.1.1.1.2.1
+++ libaitsync/src/tool.c	2011/05/09 13:46:12	1.1.1.1.2.2
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@openbsd-bg.org>
 *
 * $Author: misho $
-* $Id: tool.c,v 1.1.1.1.2.1 2011/05/08 00:49:45 misho Exp $
+* $Id: tool.c,v 1.1.1.1.2.2 2011/05/09 13:46:12 misho Exp $
 *
 *************************************************************************/
 #include "global.h"
@@ -59,4 +59,43 @@ inline int syncWriteNum(int f, u_long ulNum, int nNumL
 }
 
 #ifndef HAVE_MKSTEMPS
+#define TEMPCHARS       "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+#define NUM_CHARS       (sizeof(TEMPCHARS) - 1)
+
+int
+mkstemps(char *path, int slen)
+{
+	char *start, *cp, *ep;
+	const char *tempchars = TEMPCHARS;
+	unsigned int tries = 1;
+	size_t len;
+	int fd;
+
+	assert(path);
+	len = strlen(path);
+	if (len == 0 || slen >= len) {
+		errno = EINVAL;
+		goto end;
+	} else
+		ep = path + len - slen;
+
+	for (start = ep; start > path && start[-1] == 'X'; start--) {
+		if (tries < INT_MAX / NUM_CHARS)
+			tries *= NUM_CHARS;
+	}
+	tries *= 2;
+
+	do {
+		for (cp = start; cp != ep; cp++)
+			*cp = tempchars[arc4random_uniform(NUM_CHARS)];
+
+		fd = open(path, O_CREAT | O_EXCL | O_RDWR, S_IRUSR | S_IWUSR);
+		if (fd != -1 || errno != EEXIST)
+			return fd;
+	} while (--tries);
+
+	errno = EEXIST;
+end:
+	return -1;
+}
 #endif